Improvement in regenerative hot-blast stoves



ZShee-ts-'-SheeH-. C. COGHBANE & E. A. GOWPEB.

. v Regenerative Hot Blast Stoves. No.167,644, PatentedSept.14,187-5.

N PETERS. FEDTO-UTHOGRAPHEFL WASHINGTON, D C.

(JOWPER, OF WESTMINSTER, ENGLAND.

IMPROVEMENT IN REGENERATIVE HOT-BLAST ST'OVE Si Specification formingpartof LettersPatent-No. 167,644, dated'Septem March 16, 1875.

To all whom it may concern:

Be it known that we, CHARLES GooHRANn, of the Grange, Stourbridge, inthe county of Worcester, England, and EDWARD ALFRED OOWPER, of N 0. 6Great GeorgeStreet, Westminster, in the county ofll/Iidd lesex, England,

have invented an Improvement in Regenerative Hot-Blast Stoves, forheating air, steam, and other gases; and do hereby declare that thefollowing description, taken in connection with the accompanying platesof drawings hereinafter referred to, forms a full and exactspecification of the same, wherein we have set forth the nature andprinciples of our said improvement, by which our invention may bedistinguished from others of a similar class, together with such partsas we claim and desire to secure by Letters Patent-that is to say:

Our invention relates to hot-blast stoves of the kind used for heatingblast for blast-furnaces, known as Gowpers stoves, in which fire-bricksurfaces are arranged to act as re-- generators for absorbing and givingoff heat on the principle set forth in the specification of a Britishpatent granted to Frederic Siemens on the 2d December, 1856, No. 2,861.

Our present invention consists in' applying to such stoves means ofdistributing the volume of flame or products of combustion among thepassages in theregenerator in a more perfect manner than heretofore, sothat an equal or nearly equal quantity shall pass through each of thepassages, and also that the cold air, on being passed through the heatedregenerator, shall likewise be equally distributed and become uniformlyheated, and thus give a higher temperature of blast than heretofore. Forthis purpose we construct within the stove a vertical flue, which weprefer to be circular in section, for the flame or products ofcombustion to ascend from the lower part of the stove to the upper part,and we place it close to one side of the stove, or'against the internalbrick lining thereof opposite to the chimney-valve. From theupper partof the stove the flame or products of combustion descend through theregenerative passages, and thus the total length of passage through anypart of the stove being nearly the same, the flame at the one time andthe air at another time flows with her 14', 1.875 application filedequal freedom through any of these passages,

1 In order still furthertoinsure the uniformdis:

tribution of the flow throughthe passages,we 5 form at or near the top feach of the-regenerator-passages a contraction, which. reduces; the areaof inlet to such passage,and thereby prevents the flow-throughitof morethanits due share, thus having the eft'ectof' dividingup the wholecurrent, and causing it to ,bedis-i tributed, more uniformly among all.the passages, whereby the action of the stove is ren- .dered moreperfect, and the blast is heated to a higher temperature than formerly.

The contractions above described may be arranged so that there may beslightly diflerent areas through the passages, according to theirposition in the stove, the area being somewhat more contracted forpassages which have less total length. The improvements above set forthare applicable, also, in stoves e loyed for heating gas, steam, or otheraerif l l liquids, as may be readily understood.

Figures 1 and 2 show, respectively, a vertical section and a sectionalplanof one of a set of regenerative hot-blast stoves, in which A is theair-tight casing, of wrought-iron; -B, the fire-brick lining O, thevertical flue. D is the gas-valve, through which gas for combustion is'admitted. E is the air-valve for the admission of air for combustion.The flame produced by the combustion of the gas passes up the verticalflue U and down through the regenerator F, and away to the chimneythrough the chimney-valve G, as indicated by the arrows. When the stoveis sufficiently heated, the gas-valve D, the air-valve E, and thechimney-valve G are closed, and, the coldblast valve H being thenopened, the blast passes through the regenerator F and down the verticalflue 0 through the hot-blast valve I to the blast-furnace, in thedirection opposite to that indicated by the arrows.

From the above arrangement, it will be seen that the currents that enteror leave that part of the regenerator F nearest the flue O at top, havethe farthest distance to travel at bottom to or from the chimney orcold-blast valves G and H, and vice versa, so that the totaldistancestraversed by the fluid currents passing through the stove are equal, ornearly so.

CHARLES: oooHnANnon GRANGE, s'rounnninen, AND nnwnnn nnaan.

Fig. 3 is a plan,and Fig. 4 is a section, to an enlarged scale, of aportion of the regenerator F which is formed of a number of fire-bricksplaced at a distance apart, so as to form small passages through themass. Over the top course of bricks tiles KK, with holes in them, areplaced to cause an equal flow of the'products of combustion among allthe passages, the holes being made smaller than the area of thepassages, as shown. J is a brush for removing the dust from thepassages.w i

Fig. 5 is a plan, and Fig. 6is a section, of another arrangement ofbricks for the regenerator F. V In this case the bricks are placed inlines crossing each other. I

For clearing out any slight dust that may settle in the stove, it isconvenient to blow it outby means of the blast put on at a time whenthere is a valve open to the outer air. A

' convenient mode of doing this is to provide a a second gas-valve somedistance back in the gas-main, and to open a door or valve between thisgas-valve and that on the stove so that the dust is blown out of thegas-passage.

We do not claim, broadly, a regenerative hotblast stove with anadmission-flue at one side thereof.

Having thus described the nature of our invention, and in what mannerthe same is to be performed, we hereby declare that we do not claim,generally, the use of regenerative stoves for heatingthe blast offurnaces but we claim 1. The cylindrical regenerative hotblast stovedescribed, having a flue at one side,and inlets and outlets on the otherside, and having the plates K with narrowed apertures covering theregenerative passages, as and for the purposes described.

2. In regenerative hot-blast stoves, with checker-work filling, theplates K with apertures of smaller area than the passages of the

